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From The Collaborative International Dictionary of English v.0.48:
Nodal \Nod"al\, a. Of the nature of, or relating to, a node; as, a nodal point. [1913 Webster] Nodal line, Nodal point, in a vibrating plate or cord, that line or point which remains at rest while the other parts of the body are in a state of vibration. [1913 Webster]